Getting through those first early milestones--first sober weekend, first sober anything--are vital for your recovery. They show you that you can do it.
Friday nights were hard for me. While I drank every day, Friday meant I could cut loose. We all have associations we make with our drinking that become triggers. But in reality there was only one trigger--alcohol and my addiction to it. THAT is what made me want to drink. Not the day of the week, not music, not driving past some old familar haunt. I wanted to drink. Period.
Good luck to you. Let us know Sunday night how it went for you.